This will definitely live on as one of the Top Ten tributes paid to David Letterman's lasting legacy.

We're all still pretty sad about the announcement of Dave's retirement sometime next year, but he got a pretty great sendoff courtesy of The Simpsons!

Set to the epic Rhapsody in Blue, this variation of the opening sequence to the animated series has Homer, Marge, Bart, Lisa, and the little baby who killed Mr. Burns receiving a chance to be guests on The Late Show and sit on a perhaps even more famous couch.

This gag deserves a huge standing ovation, without the assistance of an applause sign! Best. Couch gag. Ever.

At the end of the opening, the show had this somber message for the late night great: